Cha`o ca'c ba.n, Ddo^'i vo+'i nhu+~ng ngu+o+`i co' kha? na(ng nghie^n cu+'u, la`m vie^.c ddo^.c la^.p, to^i cho ra(`ng Nha^.t ba?n la` mo^i tru+o+`ng ra^'t to^'t. So sa'nh vo+'i he^. tho^'ng thu+ vie^.n o+? A'o (Vienna Univ., Innsbruck Univ.) thu+ vie^.n o+? ca'c tru+o+`ng dda.i ho.c o+? Nha^.t to^'t ho+n nhie^`u. Ma'y mo'c cu?a ho. ra^'t hie^.n dda.i va` phong phu'. ncv